Magic Square detector | Python Fiddle

#Finn O'Hara
#February 17, 2017

#Magic Square
#------------

n = []
isMagic = True

line1 = "3 7 5 1" #Would be input
line2 = "7 4 1 3"
line3 = "5 1 3 7"
line4 = "1 3 7 5"

for number in line1:
    try:
        int(number)
        n.extend(number)
    except:
        pass
for number in line2:
    try:
        int(number)
        n.extend(number)
    except:
        pass
for number in line3:
    try:
        int(number)
        n.extend(number)
    except:
        pass
for number in line4:
    try:
        int(number)
        n.extend(number)
    except:
        pass

magic = int(n[0]) + int(n[1]) + int(n[2]) + int(n[3])

#Check rows
if int(n[4]) + int(n[5]) + int(n[6]) + int(n[7]) == magic:
	pass
else:
    isMagic = False
    
if int(n[8]) + int(n[9]) + int(n[10]) + int(n[11]) == magic:
	pass
else:
    isMagic = False
    
if int(n[12]) + int(n[13]) + int(n[14]) + int(n[15]) == magic:
	pass
else:
    isMagic = False
    
#Check columns

if int(n[0]) + int(n[4]) + int(n[8]) + int(n[12]) == magic:
	pass
else:
    isMagic = False
    
if int(n[1]) + int(n[5]) + int(n[9]) + int(n[13]) == magic:
	pass
else:
    isMagic = False
    
if int(n[2]) + int(n[6]) + int(n[10]) + int(n[14]) == magic:
	pass
else:
    isMagic = False
    
if int(n[3]) + int(n[7]) + int(n[11]) + int(n[15]) == magic:
	pass
else:
    isMagic = False

if isMagic == True:
    print "This is a magic square!"
else:
    print "This isn't a magic square"

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